Application of immunocapture and nanoflow LC–MS/MS to overcome the barriers to the quantitation of oxytocin in plasma of women in third stage labour

Author:

Bijttebier Sebastiaan1,Nguyen Tri‐Hung2,McIntosh Michelle P.2,Kirkpatrick Carl2ORCID,Remmerie Bart3,Dillen Lieve1,Lambert Pete2

Affiliation:

1. Janssen Pharmaceutica Bioanalytical Discovery & Development Sciences Beerse Belgium

2. Drug Delivery Disposition and Dynamics Monash University 381 Royal Parade Parkville VIC 3052 Australia

3. Janssen Pharmaceutica Clinical Pharmacology Beerse Belgium

Abstract

AimsPostpartum haemorrhage (PPH) is the leading cause of maternal mortality worldwide. To prevent PPH, the WHO recommends administration of oxytocin (OT) immediately after birth, i.e. during the third stage of labour (TSL). Previous studies demonstrate that methods to quantify OT in biological matrices, e.g. enzyme‐linked immunosorbent assays (ELISA), radioimmunoassays (RIA) and liquid chromatography–tandem mass spectrometry (LC–MS/MS) lack the specificity and/or sensitivity to accurately quantify OT in plasma from women administered OT during TSL. This is due to increased metabolic clearance of OT in late‐stage pregnancy and at the time of childbirth, resulting in extremely low OT plasma concentrations. This study describes the development of an ultra‐sensitive bioanalytical method that overcomes the issues previously reported and enables accurate pharmacokinetic analyses of exogenously administered OT in TSL.MethodsA selective and sensitive assay to quantify OT in TSL plasma was developed. Immunoprecipitation (IP) was applied to selectively extract OT from the TSL plasma, thereby generating clean extracts compatible with nanoflow LC (nLC). nLC–MS/MS was chosen for its high sensitivity and ability to differentiate between OT and potentially co‐captured OT‐like immunoreactive products.ResultsThe presented methodology is accurate and precise, with a good linear fit between 100–10 000 fg mL−1 OT. TSL plasma samples from a clinical phase 1 study (NCT02999100) were analysed successfully, enabling OT quantification down to 100 fg mL−1.ConclusionsThe presented IP–nLC–MS/MS method succeeded in overcoming the sensitivity challenge related to the assay of OT in TSL plasma and thereby revealing the PK profiles of OT in TSL plasma clinical study samples.

Funder

Janssen Pharmaceutica

Publisher

Wiley

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